HEF4001BT from Nexperia, in a SOIC-14. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	1A	input	Gate 1, input A. CMOS logic input to the first 2-input NOR gate. Includes clamp diodes to VDD and VSS, allowing use of series current-limiting resistors to interface signals above VDD.
2	1B	input	Gate 1, input B. CMOS logic input to the first 2-input NOR gate. Includes clamp diodes to VDD and VSS.
3	1Y	output	Gate 1 NOR output. Y = NOR(A, B). Standardized symmetrical CMOS push-pull output. Typical drive: IOL ≈ 0.5 mA at VOL = 0.4 V (VDD = 5 V).
4	2Y	output	Gate 2 NOR output. Y = NOR(A, B). Standardized symmetrical CMOS push-pull output.
5	2A	input	Gate 2, input A. CMOS logic input to the second 2-input NOR gate. Includes clamp diodes to VDD and VSS.
6	2B	input	Gate 2, input B. CMOS logic input to the second 2-input NOR gate. Includes clamp diodes to VDD and VSS.
7	VSS	power_in	Ground reference (0 V). Negative supply rail for all four NOR gates.
8	3A	input	Gate 3, input A. CMOS logic input to the third 2-input NOR gate. Includes clamp diodes to VDD and VSS.
9	3B	input	Gate 3, input B. CMOS logic input to the third 2-input NOR gate. Includes clamp diodes to VDD and VSS.
10	3Y	output	Gate 3 NOR output. Y = NOR(A, B). Standardized symmetrical CMOS push-pull output.
11	4Y	output	Gate 4 NOR output. Y = NOR(A, B). Standardized symmetrical CMOS push-pull output.
12	4A	input	Gate 4, input A. CMOS logic input to the fourth 2-input NOR gate. Includes clamp diodes to VDD and VSS.
13	4B	input	Gate 4, input B. CMOS logic input to the fourth 2-input NOR gate. Includes clamp diodes to VDD and VSS.
14	VDD	power_in	Positive supply voltage. Operating range 3.0 V to 15.0 V; absolute max 18 V. Supplies all four NOR gates.

Key specifications

Parameter	Value
Manufacturer	Nexperia
Package	SOIC-14
Category	Logic
Pins	14

Ordering variants

Same part, different packaging or reel option.

HEF4001BTT

CAD (KiCad official)

Symbol: HEF4001BT
Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
3D model: SOIC-14 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Nexperia datasheet (9 pp, sha256 231cccb55ff45222, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF